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Theresa May will ask Jeremy Corbyn for his support in delivering Brexit and pushing through legislation as she faces up to the “reality I now face as Prime Minister”.

Mrs May will on Tuesday make a direct appeal to opposition parties to “contribute, not just criticise” and help “clarify and improve” her policies in the Commons instead of undermining them.

It comes at a time Mrs May's leadership is at its weakest, amid open calls by Tory MPs for her to stand down following her failure to secure a majority at the election.

Her comments are likely to spark fear among pro-Brexit Conservatives that Mrs May is willing to compromise on their ambition for a hard Brexit.

However the Prime Minister is determined not to soften her position on Brexit and insists that ending the jurisdiction of the European Court of Justice and leaving the Single Market and Customs Union remain a red line.

Speaking at the launch of a review into modern working practices, the Prime Minister will say: “When I commissioned this report I led a majority government in the House of Commons. The reality I now face as Prime Minister is rather different.

“In this new context, it will be even more important to make the case for our policies and our values, and to win the battle of ideas both in Parliament as well as in the country.

“So I say to the other parties in the House of Commons… come forward with your own views and ideas about how we can tackle these challenges as a country.

“We may not agree on everything, but through debate and discussion – the hallmarks of our Parliamentary democracy – ideas can be clarified and improved and a better way forward found.”

Theresa May, the Prime Minister

But Mrs May will insist that despite the Conservative’s failure to win her commitment to change Britain remains “undimmed” and that she is the “bold” leader that the UK needs at a time of “great national change”.

Mrs May's intervention comes as Labour, the Liberal Democrats, the SNP and the Greens are this week set to unveil plans to derail Mrs May’s plans for Brexit by tabling amendments to the Repeal Bill.

The bill, which is being published on Thursday - the first anniversary of May becoming Prime Minister - transfers 12,000 EU laws and regulations into British statute.

Labour and other parties have warned it is set to become a “legislative battleground” as they seek to ensure the continued influence of the European Court of Justice after Brexit.

They also want to curtail the use of secondary legislation, known as Henry VIII clauses, which will enable the Government to make changes to legislation without full parliamentary scrutiny.

Mrs May is also under mounting pressure from within her own Cabinet after Philip Hammond, the Chancellor, said it would be “madness” not to remain as close as possible to the European Union.

Theresa May and Jeremy Corbyn

She will say that it is in the “spirit” of co-operation that her Government will seek to take forward her agenda in the months ahead “at a critical time in our history”.

“It is in that spirit that we will take this agenda forward in the months ahead," she will say. "And this new context presents us as a government with a wider choice.

“We can play it safe or we can strike out with renewed courage and vigour, making the case for our ideas and values and challenging our opponents to contribute, not just criticise.

“In everything we do, we will act with an unshakeable sense of purpose to build the better, fairer Britain which we all want to see."

Her speech is intended to address concerns that she is leading a “Zombie” Government and lacks a sufficient majority to bring forward policies and deliver Brexit after the Tories’ disastrous election.

The Prime Minister will say “Though the result of last month’s general election was not what I wanted, those defining beliefs remain.

“My commitment to change in Britain is undimmed; my belief in the potential of the British people and what we can achieve together as a nation remains steadfast; and the determination I have to get to grips with the challenges posed by a changing world never more sure.”

In signs of a mounting rebellion it emerged that Andrew Mitchell, a Tory MP and former chief whip, reportedly told a private dinner that Mrs May is "dead in the water", has "lost her authority".

Mr Mitchell, a close ally of Brexit Secretary David Davis, said that Mrs May is “weak”. There were also reports that a “kamikaze” group of right-wing Tory MPs are ready to risk handing power to Labour because “a brief dose of a Corbyn Government” would end in disaster and provide a long-term boost to the Tories.

A senior Government source told The Telegraph that rebel MPs should be “careful what they wish for”. David Lidington, the Justice Secretary, accused Tory MPs calling for Mrs May to stand down of “drinking too much Prosecco” and having “too much Sun” at summer parties.

At the weekend Downing Street was also forced to deny claims that Mrs May would resign later this month, citing ill health.

Sir Vince Cable, who is expected to become the next leader of the Liberal Democrats warned that Brexit may still not happen and said his party still wants a second referendum.